Altcoin, the abbreviation for alternative coin, or alternate coin, or all blockchain projects and related currency that exist in addition to Bitcoin.

Bearish, a downward trend.

Block is a part of the Blockchain and is usually associated with an encrypted hash with the previous block in the block.

Blockchain, very neatly explained by Nieuwsuur, but in text: a decentralized database that maintains a data list that can not be manipulated.

BTC (฿). I do not intend to spell out all currencies, but Bitcoin is an exception.

Bullish, an upward trend.

Core wallet, a wallet that contains the whole blockchain and most of the time delivers tools to give developers the ability to program in or on the blockchain.

Dapps aka applications written in the blockchain, which means it’s a decentralized applications = Dapp.

Circulation supply, number of coins that are actually circulating.

Dappsaka applications written in the blockchain, which means it’s a decentralized application aka Dapp.

Electrum wallet, a light weight wallet to store coins. Doesn’t download the blockchain, but gets the information from a thirth party.

Encryption, data lock that can only be unlocked with a private key.

Exchange, sometimes called coinexchange, is the exchange office where buyers and sellers can trade in Bit and Altcoins. Examples are Litebit, BTCdirect, Kraken and Bittrex.

FOMO means Fear Of Missing Out. As the term suggests, the Bitcoin or an altcoin rises sharply in value and investors take steps without rationale – so emotion – because they are afraid to miss the boat.

FUD stands for Fear, Uncertainty & Doubt. In the world of crypto FUD means spreading fear, uncertainty or doubt about a certain blockchain project.